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The ES3247B is our top of the range three channel multi purpose programmer, offering three completely independent time controlled channels. Ideal for control of two individual heating zones and separate hot water control giving you the opportunity to operate the system in the most energy efficient and cost effective manner. The multi-channel capabilities enables installers to comply with Part L of the amended Building Regulations by providing separate timed heating control for living and sleeping zones whilst also providing timed control of hot water. The blue back light on the programmer can be switched permanently on or off, depending on the userﾒs preference.When the back light is off, it can be lit at the push of a button and will then turn off again. The programmer can be configured for 24 hour, 5/2 day or 7 day operation, and has the flexibility of two or three on/off timings per day.